GoKawiilOpen-source firmware turns M5Stack PaperMono into synced e-paper shopping list
A developer released PaperMono Shopping List, an open-source C++ firmware (about 2,400 lines) for the M5Stack PaperMono, an ESP32-S3 device with a 3.97-inch e-paper touchscreen. The firmware turns the device into a fridge-mounted shopping list with touch input, an on-screen keyboard, and a companion mobile web page that keeps the list synced.